I assume you are talking about "suspended" chords and not "sustained" chords?? As in Gsus, Asus2, Dsus4, etc?? The sus stands for suspended, not sustained. Basically, whenever you see a suspended chord, you should take out the third and replace it with either a second or a fourth, as indicated by the chord symbol. If there is no number, it is assumed to be a fourth. So, for example, whereas Dmaj would be D, F#, and A; Dsus4 would be D, G, and A. Whereas Amaj would be A, C#, E; Asus2 would be A, B, and E. Get it??
An augmented is simply a major chord with the fifth raised up a half step. So, for example, whereas Gmaj would be G, B, and D; Gaug would be G, B, and D#. Whereas Ebmaj would be Eb, G, and Bb; Ebaug would be Eb, G, and Bnat.
I hope that made sense. I've got a few threads that I want to link you to... hold on while I go and find them.
In His love,
Nate